The world in 640 AD — what happened that year

8 events the sources record for this year, grouped by region.

What happened

Hou Junji pacified Gaochang and established the prefecture of Xizhou there. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書卷3 貞觀14年)
Hou Junji took Gaochang (in the twelfth month he captured the King of Gaochang and presented him). (New Book of Tang (Xin Tangshu), Annals 新唐書卷002 太宗貞觀14年8月)
In August 640, Xin Liao'er, a Zhonglangjiang, is sent as vanguard and dashes by night to the Gaochang capital; Gaochang resists and is defeated, and the great army follows and arrives beneath the walls. (Zizhi Tongjian (Comprehensive Mirror) 권195 640년 항)

Conquest of Egypt (Al-Tabari, History of the Prophets and Kings Series I tom.5 sect.1 (Arg.) [india.history.resource.86986], Annus 20)

Alexandria surrenders by treaty (not by force of arms) (Al-Tabari, History of the Prophets and Kings Series I tom.5 sect.1 (Arg.) [india.history.resource.86986], Annus 20)
Amr founds Fustat (Al-Tabari, History of the Prophets and Kings Series I tom.5 sect.1 (Arg.) [india.history.resource.86986], Annus 20)

The pope-elect John sent the Scots a letter about the date of Easter and the Pelagian heresy. (Bede, Ecclesiastical History of the English People Bede HE 2.19)

Earconbert, king of Kent, ordered the idols in his kingdom to be destroyed. (Bede, Ecclesiastical History of the English People Bede HE 3.8)